Improvement in apparatus for grinding harvester-cutters



J; F.-'& R. (5.; KiRKWOOD.

Apparatus: for Grinding Harvestelr-Cuttrsf Patented July 2, 187 2.

W wi 0% f IRA/5;! i l 2555:)

PATEN JOHN F. KIRKWOOD AND ROBERT G. KIRKWOOD, OF ELLIOOTT CITY, MD.

IMPROVEMENT IN APPARATUS FOR GRINDING HARVESTER-CUTTERS.'

Specification forming part of Letters Patent No. 128,634, dated .Iuly 2, 1872.

SPECIFICATION.

To all whom it may concern:

Be it known that we, J OHN F. and ROBERT G. KIRKWOOD, of Ellicott City, in the county of Baltimore and State of Maryland, have inventeda new and useful Improvement in Apparatus for Grinding Harvester-Cutters; and we do hereby declare the following to be a full, clear, and exact description of the same, referencebeing had to the accompanying drawing, in which- 7 Figure 1 is a perspective view of our device in operation. Fig. 2 is a perspective View of a portion of the holder, showing the clampingbolt. Figs. 3 and 4. represent the manner of adjusting the holder either horizontally or obliquely.

Our invention relates to that class of devices for grinding the cutters of harvestingmachines, which are designed to be attached to and operated in connection with a common grindstone; and it consists, mainly, in the manner of construction, whereby we adapt our device to grindstones of any diameter or thickness; and it also consists in various details of construction, which will be fully understood fromthe following particular description.

A is an ordinary grindstone, mounted in a common frame, B. Our grinder-frame is secured to the frame B at one or the other end thereof, as may be required. It consists of a frame or holder, 0, to which the cutter-bar is attached and clamped by T-head screw-bolts D, working between guide-lips d d, which at the same time serve as guides to keep said screw-bolts in position and place, and also as stops for the back of the cutter-bar, to keep said bar in position upon the holder 0. Other guide-lips, c c, are placed upon the holder 0 at such points as may be required. The bolts Dare made with T-heads, so as to obtain a long bearing between the guides d d, behind the bolt. The holder 0 is provided on the back edge with a projecting hinge-plate, E, which is fitted between the jaws F, and secured therein by a pivot-pin, so that upon said pin the holder 0 may havea motion in aplane perpendicular to its length. The jaws F are mounted upon the bar G, and is adjustable along the length of said bar by means of the holes 9 g, or an equivalent slot, through which the pivot-pin f is inserted, so that upon said pivot-pin the holder 0 may have a movement in a plane parallel with its length.

The two adjustments above described are sufficient to adapt this apparatus to grind stones which are sufficiently thick to cover the whole length of a cutter-section but many stones are not sufficiently thick to accomplish that, and therefore another adjustment is required to enable the holder to ap proach the face of the stone obliquely, and this object we accomplish by making the bar G adjustable upon pivots at its ends. The axis of the pivot f may then be inclined as much as necessary to produce the requisite obliquity of the holder 0 to the periphery of the stone. The feet or standards H, which attach the parts above described to the frame B, are provided with slots h, by means of which the whole device may be shifted nearer to or further from the stone A, as may be required by the length of the cutter-section from point to base, without removing the bolts I from the frame B.

When the grinding of all the cutter-sections has been completed as to one edge, it is necessary, unless the crank of the grindstone can be shifted, to remove the cutter-holder to the opposite end of the frame B. To remove the fastening-bolts I from one end and replace them at the other is troublesome, and requires too much time. We therefore form the slots h-with enlarged ends, as shown, so that it is only necessary to loosen the bolts I, and the feet H may be at once removed and refixed by other screw-bolts, permanently placed in the opposite end of the frame B.

Having described our invention, what we claim as new is-- 1. The combination of the holder 0, guides d d, and T-h'ead clamping-bolts D, as set forth.

2. The combination of the jointed holder 0, pivoted jaws F, and rocking bar Gr, substantially for the purpose set forth.

3. In combination with the holder 0, pivoted jaws F, and rocking-bar G, the feet H, constructed with slots h enlarged at one end, as and for the purpose set forth.

JOHN F. KIRKWOOD. ROBERT G. KIRKWOOD.

Witnesses:

R. D. 0. SMITH, Jno. D. PATTEN. 

